Kansas DUI Laws Explained

By Javier Marín, Editor·Last reviewed September 2026·How we check this

Kansas charges impaired driving as DUI — Driving Under the Influence, under K.S.A. 8-1567. A DUI arrest triggers two parallel processes: a criminal case in municipal or district court and an administrative license action by the KDOR Division of Vehicles. Both move quickly, and a driver has only 14 days from arrest to request a hearing on the administrative side.

The legal threshold

Kansas's per-se DUI thresholds:

Adults 21 and older: 0.08% BAC.
Aggravated DUI: 0.15% BAC and above.
Drivers under 21: 0.02% BAC under Kansas's zero-tolerance law (a separate offense from adult DUI).
Commercial drivers (CDL): 0.04% BAC.
Drug or polysubstance DUI: impairment by any controlled substance, prescription medication, or combination, prosecuted on impairment evidence rather than a numerical threshold.

Kansas can also charge DUI on impairment evidence below 0.08% if the prosecution shows the driver was actually impaired, but the per-se threshold removes the need to prove impairment beyond the BAC reading.

The 14-day hearing window

After a Kansas DUI arrest where the BAC was 0.08% or higher (or the driver refused chemical testing), the officer typically issues a notice of administrative license suspension and confiscates the physical license, replacing it with a 30-day temporary permit. The driver has 14 calendar days from arrest to request an administrative hearing under K.S.A. 8-1020. The hearing addresses three narrow questions: did the officer have reasonable cause to stop and arrest, was the BAC at or above 0.08%, and did the chemical test follow proper procedure. Winning the administrative hearing prevents the administrative suspension; the criminal case proceeds independently.

First-offense penalties

A Kansas first-offense DUI conviction at the standard 0.08% threshold typically produces:

Jail time: 48 hours minimum (or 100 hours of community service in lieu) up to six months.
Fines: $750 to $1,000 in base fines, plus court costs and assessments that often add several hundred more.
License suspension: 30-day hard suspension, then a one-year IID-restricted license.
Mandatory IID: ignition interlock device installed for at least one year on a first offense, paid by the driver.
Alcohol and drug evaluation: court-ordered evaluation and any recommended treatment before reinstatement.
SR-22 financial responsibility filing for at least three years — see Kansas car insurance.
Probation: up to one year of supervised or unsupervised probation depending on the court.

Aggravated DUI at 0.15% and above

Kansas's aggravated DUI threshold of 0.15% BAC carries enhanced penalties even on a first offense: longer minimum jail time, higher fines, longer IID requirement, and additional court conditions. Aggravated DUI is also given more weight in any future DUI lookback comparison.

Mandatory ignition interlock

Kansas requires an ignition interlock device on every DUI conviction since the 2011 statutory expansion, regardless of BAC. The IID prevents the vehicle from starting if the driver's breath shows alcohol, runs random rolling tests during operation, and reports data to the state's IID program. The driver pays installation (about $100 to $150) and monthly monitoring fees (about $70 to $100). The IID stays installed for at least one year on a first offense and longer on aggravated or repeat offenses.

Repeat offenses

Kansas's lookback for DUI enhancement includes certain prior convictions over the driver's lifetime, with additional weight for priors within 10 years. A second DUI brings:

Mandatory minimum 90 days in jail (with limited work-release options) up to one year.
Fine $1,250 to $1,750.
One-year hard license suspension followed by a two-year IID-restricted license.

A third DUI is a felony in Kansas, carrying 90 days to one year in jail, $1,750 to $2,500 fine, and a one-year hard suspension followed by a three-year IID-restricted license. A fourth or subsequent DUI escalates to a higher felony grade with longer prison sentences.

Refusal to test

Kansas's implied-consent statute, K.S.A. 8-1001, treats refusal of the chemical test at a DUI stop as a separate administrative offense. A first refusal carries a one-year suspension and a one-year IID-restricted period. A second refusal carries a longer hard suspension and a longer IID period. Refusal does not bar prosecution for DUI — the prosecution can proceed on field-sobriety and impairment evidence alone — and refusal cases typically face a longer hard-suspension period before any IID-restricted license is available.

Underage zero-tolerance

Drivers under 21 with a BAC of 0.02% or higher face an automatic 30-day administrative suspension on the first offense, followed by a six-month restricted-license period. These are separate from any criminal DUI charge. The Restricted License under Kansas's GDL system can also be revoked entirely if the teen is caught at or above the 0.02% threshold during the GDL stages.

Diversion option

Some Kansas prosecutors offer a DUI diversion agreement on a first offense for eligible drivers: the driver completes the alcohol evaluation, treatment, IID installation, fines, and a clean-record period; in exchange, the underlying conviction is held in abeyance and dismissed at the end of the diversion. Diversion eligibility depends on the driver's history, the BAC level, whether anyone was injured, and the prosecutor's policy. A successful diversion still counts as a prior conviction for any future DUI enhancement.